Fluorescence spectroscopy of semiconductor CdTe nanocrystals: preparation effect on photostability

• Authors: Łukasz Bujak , Maria Olejnik , Radek Litvin , Dawid Piątkowski , Nicholas Kotov , Sebastian Mackowski
• Languages of publication: EN

Abstracts

EN

We report on continuous-wave and time-resolved fluorescence spectroscopy studies of CdTe water-soluble nanocrystals at room temperature. For nanocrystals spread directly on the substrate we observe large variation both in fluorescence maximum energy and fluorescence lifetime. We attribute this to the influence of the surface of the nanocrystals on the stability of excitations in the nanocrystals. As the fluorescence lifetime of the nanocrystals is monitored, we find it increases with time from 6 to 18 ns and then saturates. Placing the nanocrystals in a polymer matrix remarkably improves the photostability and all the above-mentioned effects are diminished. Upon mixing the nanocrystals with gold spherical nanoparticles we observe a decrease of the fluorescence intensity due to efficient energy transfer to the nanoparticles.

Keywords

EN

semiconductor nanocrystal; fluorescence; plasmon interaction; photostability

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2011
• Volume: 9
• Issue: 2
• Pages: 287-292

Dates

published

1 - 4 - 2011

online

20 - 2 - 2011

Contributors

author

Łukasz Bujak

• Institute of Physics, Nicolaus Copernicus University, Grudziadzka 5, 87-100, Torun, Poland

author

Maria Olejnik

• Institute of Physics, Nicolaus Copernicus University, Grudziadzka 5, 87-100, Torun, Poland

author

Radek Litvin

• Institute of Physics, Nicolaus Copernicus University, Grudziadzka 5, 87-100, Torun, Poland

author

Dawid Piątkowski

• Institute of Physics, Nicolaus Copernicus University, Grudziadzka 5, 87-100, Torun, Poland

author

Nicholas Kotov

• Department of Chemical Engineering, University of Michigan, Ann Arbor, MI, USA

author

Sebastian Mackowski

• Institute of Physics, Nicolaus Copernicus University, Grudziadzka 5, 87-100, Torun, Poland

References

• [1] V. Klimov, Semiconductor and Metal Nanocrystals: Synthesis and Electronic and Optical Properties (Taylor & FrancisInc., New York, 2003) http://dx.doi.org/10.1201/9780203913260[Crossref]
• [2] I.L. Medintz, H.T. Uyeda, E.R. Goldman, H. Mattoussi, Nat. Mater. 4, 435 (2005) http://dx.doi.org/10.1038/nmat1390[Crossref]
• [3] B.Q. Sun, A.T. Findikoglu, M. Sykora, D.J. Werder, V.I. Klimov, Nano Lett. 9, 1235 (2009) http://dx.doi.org/10.1021/nl9001469[Crossref]
• [4] J. Lee, P. Hernandez, J. Lee, A.O. Govorov, N.A. Kotov, Nat. Mater. 6, 291 (2007) http://dx.doi.org/10.1038/nmat1869[Crossref]
• [5] A.O. Govorov et al., Nano Lett. 6, 984 (2006) http://dx.doi.org/10.1021/nl0602140[Crossref]
• [6] S. Mackowski, J. Phys.-Condens. Mat. 22, 193102 (2010) http://dx.doi.org/10.1088/0953-8984/22/19/193102[Crossref]
• [7] K. Ray, R. Badugu, J.R. Lakowicz, J. Am. Chem. Soc. 128, 8998 (2006) http://dx.doi.org/10.1021/ja061762i[Crossref]
• [8] J. Zhang, R. Badugu, J.R. Lakowicz, Plasmonics 3, 3 (2008) http://dx.doi.org/10.1007/s11468-007-9047-6[Crossref]
• [9] A.L. Efros, M. Rosen, Phys. Rev. Lett. 78, 1110 (1997) http://dx.doi.org/10.1103/PhysRevLett.78.1110[Crossref]
• [10] K. Pechstedt, T. Whittle, J. Baumberg, T. Melvin, J. Phys. Chem. C 114, 12069 (2010) http://dx.doi.org/10.1021/jp100415k[Crossref]
• [11] N. Gaponik et al., J. Phys. Chem. B 106, 7177 (2002) http://dx.doi.org/10.1021/jp025541k[Crossref]
• [12] J. Kimling et al., J. Phys. Chem. B 110, 15700 (2006) http://dx.doi.org/10.1021/jp061667w[Crossref]
• [13] S. Wörmke et al., J. Fluoresc. 18, 611 (2008) http://dx.doi.org/10.1007/s10895-008-0310-9[Crossref]
• [14] S. Mackowski et al., Nano Lett. 8, 558 (2008) http://dx.doi.org/10.1021/nl072854o[Crossref]

Identifiers

DOI

10.2478/s11534-010-0128-3